/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.api.common.typeinfo;

import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.base.LocalDateComparator;
import org.apache.flink.api.common.typeutils.base.LocalDateSerializer;
import org.apache.flink.api.common.typeutils.base.LocalDateTimeComparator;
import org.apache.flink.api.common.typeutils.base.LocalDateTimeSerializer;
import org.apache.flink.api.common.typeutils.base.LocalTimeComparator;
import org.apache.flink.api.common.typeutils.base.LocalTimeSerializer;

import java.lang.reflect.Constructor;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.temporal.Temporal;
import java.util.Objects;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * Type information for Java LocalDate/LocalTime/LocalDateTime.
 */
@PublicEvolving
public class LocalTimeTypeInfo<T extends Temporal> extends TypeInformation<T> implements AtomicType<T> {

	private static final long serialVersionUID = 1L;

	public static final LocalTimeTypeInfo<LocalDate> LOCAL_DATE = new LocalTimeTypeInfo<>(
			LocalDate.class, LocalDateSerializer.INSTANCE, LocalDateComparator.class);

	public static final LocalTimeTypeInfo<LocalTime> LOCAL_TIME = new LocalTimeTypeInfo<>(
			LocalTime.class, LocalTimeSerializer.INSTANCE, LocalTimeComparator.class);

	public static final LocalTimeTypeInfo<LocalDateTime> LOCAL_DATE_TIME = new LocalTimeTypeInfo<>(
			LocalDateTime.class, LocalDateTimeSerializer.INSTANCE, LocalDateTimeComparator.class);

	// --------------------------------------------------------------------------------------------

	private final Class<T> clazz;

	private final TypeSerializer<T> serializer;

	private final Class<? extends TypeComparator<T>> comparatorClass;

	protected LocalTimeTypeInfo(Class<T> clazz, TypeSerializer<T> serializer, Class<? extends TypeComparator<T>> comparatorClass) {
		this.clazz = checkNotNull(clazz);
		this.serializer = checkNotNull(serializer);
		this.comparatorClass = checkNotNull(comparatorClass);
	}

	@Override
	public boolean isBasicType() {
		return false;
	}

	@Override
	public boolean isTupleType() {
		return false;
	}

	@Override
	public int getArity() {
		return 1;
	}

	@Override
	public int getTotalFields() {
		return 1;
	}

	@Override
	public Class<T> getTypeClass() {
		return clazz;
	}

	@Override
	public boolean isKeyType() {
		return true;
	}

	@Override
	public TypeSerializer<T> createSerializer(ExecutionConfig executionConfig) {
		return serializer;
	}

	@Override
	public TypeComparator<T> createComparator(boolean sortOrderAscending, ExecutionConfig executionConfig) {
		return instantiateComparator(comparatorClass, sortOrderAscending);
	}

	// --------------------------------------------------------------------------------------------

	@Override
	public int hashCode() {
		return Objects.hash(clazz, serializer, comparatorClass);
	}

	@Override
	public boolean canEqual(Object obj) {
		return obj instanceof LocalTimeTypeInfo;
	}

	@Override
	public boolean equals(Object obj) {
		if (obj instanceof LocalTimeTypeInfo) {
			@SuppressWarnings("unchecked")
			LocalTimeTypeInfo<T> other = (LocalTimeTypeInfo<T>) obj;

			return other.canEqual(this) &&
					this.clazz == other.clazz &&
					serializer.equals(other.serializer) &&
					this.comparatorClass == other.comparatorClass;
		} else {
			return false;
		}
	}

	@Override
	public String toString() {
		return clazz.getSimpleName();
	}

	// --------------------------------------------------------------------------------------------

	private static <X> TypeComparator<X> instantiateComparator(Class<? extends TypeComparator<X>> comparatorClass, boolean ascendingOrder) {
		try {
			Constructor<? extends TypeComparator<X>> constructor = comparatorClass.getConstructor(boolean.class);
			return constructor.newInstance(ascendingOrder);
		}
		catch (Exception e) {
			throw new RuntimeException("Could not initialize comparator " + comparatorClass.getName(), e);
		}
	}

	public static LocalTimeTypeInfo getInfoFor(Class type) {
		checkNotNull(type);

		if (type == LocalDate.class) {
			return LOCAL_DATE;
		}
		else if (type == LocalTime.class) {
			return LOCAL_TIME;
		}
		else if (type == LocalDateTime.class) {
			return LOCAL_DATE_TIME;
		}
		return null;
	}

}
